基于离散元模拟的沥青混合料单轴压缩试验细观力学分析  

Micro-mechanical analysis of uniaxial compression test of asphalt mixtures by discrete element modeling

作　　者：侯曙光[1] 徐恺[1] 张浩[1] 

机构地区：[1]南京工业大学交通学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2015年第5期73-78,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51108237)

摘　　要：通过FISH语言编程建立沥青混合料AC-16二维离散元模型,模拟了AC-16单轴压缩试验的全过程,研究了在单轴压缩试验过程中应力-应变、接触力分布、颗粒位移、接触压力和接触拉力的变化情况。研究结果表明:在单轴压缩试验过程中,随着轴向应变的增大,试件中接触压力和接触拉力的分布由密集逐渐变稀疏,并且接触压力和接触拉力集中现象逐渐减少;随着轴向应变的增加,整个试件中、集料和沥青砂浆之间、沥青砂浆之间以及集料之间的接触压力个数比例都逐渐减小,接触拉力个数比例都逐渐增大,并且,整个试件中、集料和沥青砂浆之间、沥青砂浆之间以及集料之间的接触压力均值和接触拉力均值都先增加后减小。The uniaxial compression test of asphalt mixtures was simulated using a two-dimensional discrete element model. The stress-strain relationship,contact forces and particle displacements were analyzed during different stages of the tests. The results showed that,with the increase of the axial strain,the contact force distribution became sparser,the number of the contact force concentration points decreased,the percentages of the pressure contact force number in the whole sample between asphalt mastic and aggregates in asphalt mastic and in aggregates all decreased while the percentages of the tensile contact force number increased,and the mean of the pressure contact and tensile contact forces in the whole samples between asphalt mastic and aggregates in asphalt mastic and in aggregates increased at the initial stage and then decreased.

关 键 词：沥青混合料 单轴压缩试验 离散元 接触力 位移 

分 类 号：U416.2[交通运输工程—道路与铁道工程]